Headset design



FIG. 1 is a perspective view of a headset showing my new design;

FIG. 2 shows a right-side view of the headset of FIG. 1; and,

FIG. 3 shows the front view of the headset in FIG. 1.

The surfaces not shown in FIGS. 1-3 do not form part of the claimed design. 

The ornamental design for a headset, as shown and described. 